Carrier frequency-offsets and mobility-induced Doppler shifts introduce time-selectivity in wireless links. Doppler-RAKE receivers have been developed for collecting the resulting diversity gains only for spread-spectrum systems. Relying on a basis expansion model of time-selective channels, we find that the maximum achievable Doppler diversity is determined by the rank of the correlation matri...

Frequency-domain equalization used in MC-CDMA can be applied to the reception of DS-CDMA signals. Further performance improvement can be attained by the additional use of multiple transmit/receive antenna diversity. The BER performance improvement attainable by the joint use of frequency-domain equalization and multiple transmit/receive antenna diversity in a frequency-selective fading channel ...

In our application targeted here, four on-glass antenna elements are set in an automobile to improve the reception quality of mobile ISDB-T receiver. With regard to the directional characteristics of each antenna, we propose and implement a joint Pre-FFT adaptive array antenna and Post-FFT space diversity combining (AAA-SDC) scheme for mobile ISDB-T receiver. By applying a joint hardware and so...

This paper presents the average symbol error rates (SERs) of the 16-ary phase shift keying (16PSK), 16ary amplitude phase shift keying (16APSK) and 16ary quadrature amplitude modulation (16QAM) with L-fold maximal ratio combining (MRC) and selection combining (SC) space diversity receptions over Nakagami-m fading channels. Numerical results manifested error performance improvement when Lfold MR...

A literature study has been carried out to gain insight in the problems related to applying digital wireless indoor links at frequencies around one GHz. Methods to improve the reliability of a wireless communication link include spread spectrum, adaptive equalisation and diversity techniques. In this work diversity techniques will be considered. The use of modem IC techniques makes it possible ...

Cooperative reception allows diversity to be achieved by a group of radios that are not physically connected but that receive independent copies of a message. The receivers achieve diversity by exchanging messages. One such technique is collaborative decoding, in which the receivers iterate between decoding and information exchange. Collaborative decoding has been shown to be effective for conv...

Free-Space Optical (FSO) communications link performance is highly affected when propagating through the time-spatially variable turbulent environment. In order to improve signal reception, several mitigation techniques have been proposed and analytically investigated. This paper presents experimental results for the route diversity technique evaluations for a specific case when several diversi...

In this paper, the performance of switch and stay combing (SSC) diversity receivers operating over correlated Ricean fading channels, is studied. By representing the bivariate Ricean distribution as infinite series the probability density function (PDF) of the SSC output signal-to-noise ratio (SNR) has been derived. Capitalizing on this PDF the moments of the output SNR and the corresponding cu...

In this paper, the diversity reception with correlated Rayleigh fading signals will be investigated . Results will be evaluated by converting two correlated Rayleigh fading signals into another two independent Rayleigh fading signals using transformation matrix. These results show that Optimum transformation matrix F=1 is better than F = 2 / 2 which is the elements of the optimum transformation...

In this paper, we consider multiple bit differential detection (MBDD) of differentially encoded shapedoffset quadrature phase-shift keying (SOQPSK) over slow fading channels, especially Rayleigh fading channels. SOQPSK is a highly bandwidth efficient and popular form of constant envelope continuous phase modulation (CPM). We present two versions of the MBDD algorithm: the full-size version (FMB...